Stable composite clock

Horology: time measuring systems or devices – Combined with disparate device

Reexamination Certificate

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Details

C368S046000, C368S047000, C368S156000, C331S046000, C702S075000, C702S176000, C702S190000

Reexamination Certificate

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07411867

ABSTRACT:
Apparatus and method for producing a composite clock signal with optimized stability characteristics from individual clocks which have different stabilities or variances. The composite clock signal includes weighted individual clock signals. In a first (PPN) case, an optimum composite clock is a scale-factor-weighted linear combination of clock signals. In another (non-PPN) case, the optimum stable composite clock is the output of a linear filter of the input clocks signals. Both the phases and frequencies of the individual clocks over time are estimated.

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patent: 5666330 (1997-09-01), Zampetti
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patent: 6651031 (2003-11-01), Akopian
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patent: 2002/0018402 (2002-02-01), Egle et al.
patent: 2003/0110015 (2003-06-01), Akopian
patent: 2003/0132878 (2003-07-01), Devereux et al.
patent: 2006/0192625 (2006-08-01), Sorrells et al.
patent: 2006/0255281 (2006-11-01), Lal et al.

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